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Related Concept Videos

Production Efficiency01:01

Production Efficiency

Net production efficiency (NPE) is the efficiency at which organisms assimilate energy into biomass for the next trophic level. Due to low metabolic rates and less energy spent on thermoregulatory processes, the NPE of ectotherms (cold-blooded animals) is 10 times higher than endotherms (warm-blooded animals).

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Comparative calorie values of nematodes.

N A Croll, K de Soyza

    Journal of Nematology
    |March 21, 2009
    PubMed
    Summary

    Nematode calorie values, measured using a microbomb calorimeter, generally fall at the lower end compared to other invertebrates. Specific tissues and larval stages show varied energy content, but lifestyle or size doesn't create distinct calorie differences.

    Area of Science:

    • Biochemistry
    • Zoology
    • Ecology

    Background:

    • Understanding the energy content of diverse organisms is crucial for ecological and biochemical studies.
    • Nematodes represent a significant and ecologically important group of invertebrates, yet their bioenergetics are not fully characterized.

    Purpose of the Study:

    • To determine the caloric values of a broad range of nematode species.
    • To compare nematode energy content with other invertebrate groups and investigate factors influencing it.

    Main Methods:

    • Caloric content was measured using a microbomb calorimeter.
    • A wide selection of nematode species was analyzed, including different life stages and tissues.

    Main Results:

    • Calorie values ranged from 3.86 to 6.85 Kcal/g, with a mean of 5.095 Kcal/g for 16 species.
    Keywords:
    Energeticscalorimetrycomparative energeticsparasitism

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  • Nematode mean values were lower than those reported for other invertebrates and skewed towards the lower end.
  • Larvae of Ditylenchus dipsaci showed reduced calorie values after storage; Ascaris lumbricoides tissues varied, with eggs and intestine being highest and cuticle/musculature lowest.
  • No significant calorie differences were observed between parasitic and free-living nematodes, or between large and small individuals.

    • Conclusions:

    • Nematodes exhibit relatively low caloric density compared to other invertebrates.
    • Energy content varies within nematodes based on tissue type and life stage, but not significantly by lifestyle or size.